1.A box contains 2 white balls, 3 black balls and 4 red balls. The number of ways in which three balls can be drawn from the box so that at least one of the balls is black is

2.The sum of the digits at the tens place of all the numbers formed with the help of 3,4,5,6 taken all at a time is

3.12 persons are to be arranged on a round table. If two particular persons among them are not to sit side by side, the number of arrangements is

4.A fruit basket contains 4 oranges, 5 apples and 6 mangoes. The number of ways a person make selection of fruits from among the fruits in the basket is

5.The number of arrangements of letters of the word BANANA in which the two N do not appear ad jointly is